:root {
  /* 主色调 */
  --primary-color: #667eea;
  --primary-dark: #764ba2;
  --secondary-color: #74b9ff;
  --accent-color: #00b894;
  
  /* 背景色 */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-muted: #e9ecef;
  
  /* 文字颜色 */
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --text-light: #ffffff;
  
  /* 边框和阴影 */
  --border-color: #e0e0e0;
  --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
  --shadow-heavy: 0 8px 30px rgba(0, 0, 0, 0.2);
  
  /* 圆角 */
  --radius-small: 4px;
  --radius-medium: 8px;
  --radius-large: 12px;
  --radius-xl: 20px;
  
  /* 间距 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  font-weight: normal;
}

ul {
  list-style: none;
}

body {
  min-height: 100vh;
  color: var(--text-primary);
  background: var(--bg-secondary);
  line-height: 1.6;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-family:
    Inter,
    -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    Roboto,
    Oxygen,
    Ubuntu,
    Cantarell,
    'Fira Sans',
    'Droid Sans',
    'Helvetica Neue',
    sans-serif;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
